Blud (Russian, Ukrainian: Блуд), one of the Slavic fairies in Slavic mythology, is an evil-deity that causes disorientation and leads a person aimlessly around and round. The term also refers to illicit fornication, the desire for which Slavic clerics claimed to come from the Devil.

Blud in the Russian language means: debauchery, adultery and deviation from the straight path in the literal and figurative sense.